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Longitudinal sections of a boat, taken parallel with the centre-line at fixed intervals.

Related Terms

LAMINAR FLOW

A flow situation in which fluid moves in parallel lamina or layers.

SHEAR RATE

The difference between the velocities along the parallel faces of a fluid element divided by the distance between the faces.

BYPASS FILTRATION

A system of filtration in which only a portion of the total flow of a circulating fluid system passes through a filter at any instant or in which a filter having its own circulating pump operates in parallel to the main flow.

GRID PARALLEL

A line parallel to a grid equator, connecting all points of equal grid latitude

PREVENTIVE MAINTENANCE

Maintenance performed according to a fixed schedule involving the routine repair and replacement of machine parts and components.

HORIZONTAL

Parallel to the plane of the horizon; perpendicular to the direction of gravity

HYPERBOLA

An open curve with two parts, all points of which have a constant difference in distance from two fixed points called FOCI.

IALA MARITIME BUOYAGE SYSTEM

A buoyage which is now implemented by most maritime nations. Within the single system there are two buoyage regions, designated as Region A and Region B, where lateral marks differ only in the colors of port and starboard hand marks. In Region A, red is to port on entering; in Region B, red is to starboard on entering. The system is a combined cardinal and lateral system, and applies to all fixed and floating marks, other than lighthouses, sector lights, leading lights and marks, lightships and large navigational buoys.

MOTION

The act, process, or instance of change of position. Absolute motion is motion relative to a fixed point. Actual motion is motion of an object relative to the earth. Apparent or relative motion is change of position as observed from a reference point which may itself be in motion. Diurnal motion is the apparent daily motion of a celestial body. Direct motion is the apparent motion of a planet eastward among the stars; retrograde motion, the apparent motion westward among the stars. Motion of a celestial body through space is called space motion, which is composed of two components: proper motion, that component perpendicular to the line of sight; and radial motion, that component in the direction of the line of sight. Also called MOVEMENT, especially when used in connection with problems involving the motion of one vessel relative to another.

LONGITUDINAL SEAM

A riveted or welded seam along the longitudinal axis of a boiler shell or drum.
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